math
posted by sam .
I have a question about the formula for this problem:How many ways can an IRS auditor select 3 of 11 tax returns for an audit?
I know that it is 11! / 3!(113)! But apparently I am doing something wrong because my answer is not one of my choices. Am I using the wrong formula for this problem. Please any help will be appreciated. Thanks in advance

math 
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watiz 19 divided by 219
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